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I have some products listed which can be in a cart, this cart is stored in a session variable dictionary for which the key is the product id and the value is some information about the quantity and stuff. I want to add the option to view (on the products page) how many of that product are in your cart.

I know I can access session variables in a django template like this:

{{ request.session.cart.2323.quantity }}

Problem is, the key (2323 in this case) is a variable which depends on a for loop:

{% for prod in products %}
  <p>{{ request.session.cart[prod.name].quantity }}</p>
{% endfor %}

But implementing it like that unfortunately is not possible. Is there any way in which this would be possible or would I have to change the way my cart works?

Jelle
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1 Answers1

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You should implement a custom template filter like this to have the ability to use getattr.

from django import template
register = template.Library()

@register.simple_tag
def get_object_property_dinamically(your_object, first_property, second_property):
    return getattr(getattr(your_object, first_property), second_property)

{% load get_object_property_dinamically %}
{% for prod in products %}
  <p>{% multiple_args_tag request.session.cart prod.name 'quantity' %}</p>
{% endfor %}
Oleksii Tambovtsev
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  • Thanks a lot, in the end I did not use the `getattr` but instead just `your object[first_property][second_property]`, the first did not work. – Jelle Jan 12 '22 at 01:01